- Competition-grade technology formulated specifically to deliver maximum power and protection in performance-modified diesel engines
- Extra zinc and phosphorus for bulletproof wear protection
- Fights oil breakdown under the extreme temperatures and pressures of competition, extending the lives of cylinders, rings, cranks, rods, turbochargers and bearings
- High-viscosity formulation provides an extra level of protection, while offsetting the negative effects of fuel dilution
- Delivers superior shear stability to withstand the intense stress and compression common to high-horsepower diesel trucks
- May be used in any diesel engine calling for an API CK-4, CJ-4, CI-4+ or CH-4 diesel oil
*compared to the 3.5cP HTHS limit for SAE 15W-40
This article is part of our Diesel Oil and Maintenance guide. See every article in the guide.
Recommended AMSOIL products
Start with AMSOIL synthetic diesel oil and find the exact AMSOIL products for all your vehicles with the AMSOIL Product Guide.








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Joel Youngman is Lead Technical Writer at AMSOIL and associate editor of AMSOIL Magazine. He develops and edits content covering lubricant technology, product testing, vehicle systems, maintenance practices and equipment applications. Youngman also coordinates magazine articles and Tech Talk columns, working with engineers, product specialists and Communications personnel to maintain technical accuracy, editorial consistency and clear customer communication.
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